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Linux.com: A Dozen Tips for Testing Free Software

"One of the best ways you can participate in the free and open
source software (FOSS) revolution is by helping to test software
and reporting bugs and issues to project developers to help them
improve their code. Even in the wild and woolly, sometimes
undisciplined approach to development that we see in FOSS projects,
there are ways to test more effectively. Here are more than a dozen
tips suggested by testing gurus and developers that can help you
become a successful tester.

"When I first began programming in the 1960s, testing was done
to prove that code worked. The first big change to that approach
came with IBM's Black Team, which took the opposite tack and tried
to break the code--an approach that was radical at the time. In the
next popular phase, the color of testing changed, and white box
testing, in which you know what a program is supposed to do and
check that it does it, was all the vogue..."